This morning I took a small step ladder to get above the mushrooms to take the shot of the circle. It didn't look very interesting at all! Some tiny mushrooms in a large circle with lots of grass. No, didn't work for me. I went back and got the macro lens. To get the shots meant having to get on my stomach and manoeuvre myself into a good position to get a good angle. Then I realised that pretty much each mushroom was also a circle. I took a few shots that I was happy with and ended up posting this one, but I also like a couple of others which I have included here.
1/640 sec, f / 11, ISO 250, focal length 100mm